nping

Install nmap tool, available at least for Windows, Mac and Linux and execute nping --tcp -p 3306 172.16.22.218 to test tcp connectivity for port 3306 in host 172.16.22.218:

nping --tcp -p 5432 your_postgres_host -q

nping --tcp -p 3306 172.16.22.218 -c 0
Starting Nping 0.6.47 ( http://nmap.org/nping ) at 2019-03-12 09:47 UTC
SENT (0.0125s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40  seq=1546620167 win=1480 
SENT (1.0127s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40  seq=1546620167 win=1480 
RCVD (1.0129s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44  seq=1638376953 win=29200 <mss 1460>
SENT (2.0141s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40  seq=1546620167 win=1480 
RCVD (2.0143s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44  seq=1654006808 win=29200 <mss 1460>
SENT (3.0155s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40  seq=1546620167 win=1480 
RCVD (3.0157s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44  seq=1669652324 win=29200 <mss 1460>

nping -tcp -p 443 google.com -q

Starting Nping 0.7.80 ( https://nmap.org/nping ) at 2020-01-13 17:00 +04
Max rtt: 14.615ms | Min rtt: 4.099ms | Avg rtt: 7.753ms
Raw packets sent: 5 (200B) | Rcvd: 5 (270B) | Lost: 0 (0.00%)
Nping done: 1 IP address pinged in 4.02 seconds

nping -tcp -p 443 google.com -c 0
  -c 0 number of probes. Default 5. If 0 run continuously.

Related terms

• wget
• Host sweep
• Nagios: check_tcp
• nc -v

See also

• IP: route, mtr, traceroute, tcptraceroute, lft, TTL
• ping, nping, arping, fping, gping, hping, mtr, traceroute, tcptraceroute , tracepath, Test-Connection Powershell cmdlet, iperf, Ping (PAN-OS), BWPing, check_ping, ping -M, ios ping, ping -a
• netperf, iperf, ttcp, nuttcp, BWPing
• Security tools: Vulnerability scanner, port scan, Host sweep, nmap, nping, ncat, nc, psad, Gordon Lyon

https://nmap.org/